A verified layout drawn from schematic from Dino over at
Ilovefuzz. He also suggest some mods there. The original has a TLC274 quad op amp but only two of them is used so Dino went with a dual op amp
I kept thinking while drawing this"What a mess! Oliver Ackermann is a lunatic...or genius". Hopefully all the switch connections is ok. Will probably build this after I recieve the LM567 chip.